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The LITMUS^RT kernel.

Bjoern Brandenburg

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author	Linus Torvalds <torvalds@linux-foundation.org>	2008-08-20 22:35:56 -0400
committer	Linus Torvalds <torvalds@linux-foundation.org>	2008-08-20 22:35:56 -0400
commit	6a55617ed5d1aa62b850de2cf66f5ede2eef4825 (patch)
tree	ee6cc389293bebffaf4552b9f34c20f4b2bd7967 /drivers/net/wireless/hostap/hostap_ap.h
parent	82d63fc9e30687c055b97928942b8893ea65b0bb (diff)

Linux v2.6.27-rc4v2.6.27-rc4

Diffstat (limited to 'drivers/net/wireless/hostap/hostap_ap.h')

0 files changed, 0 insertions, 0 deletions

rs, Linux kernel modules for hardware monitoring This file defines the sysfs class "hwmon", for use by sensors drivers. Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. */ #include <linux/module.h> #include <linux/device.h> #include <linux/err.h> #include <linux/kdev_t.h> #include <linux/idr.h> #include <linux/hwmon.h> #include <linux/gfp.h> #include <linux/spinlock.h> #define HWMON_ID_PREFIX "hwmon" #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d" static struct class *hwmon_class; static DEFINE_IDR(hwmon_idr); static DEFINE_SPINLOCK(idr_lock); /** * hwmon_device_register - register w/ hwmon sysfs class * @dev: the device to register * * hwmon_device_unregister() must be called when the class device is no * longer needed. * * Returns the pointer to the new struct class device. */ struct class_device *hwmon_device_register(struct device *dev) { struct class_device *cdev; int id, err; again: if (unlikely(idr_pre_get(&hwmon_idr, GFP_KERNEL) == 0)) return ERR_PTR(-ENOMEM); spin_lock(&idr_lock); err = idr_get_new(&hwmon_idr, NULL, &id); spin_unlock(&idr_lock); if (unlikely(err == -EAGAIN)) goto again; else if (unlikely(err)) return ERR_PTR(err); id = id & MAX_ID_MASK; cdev = class_device_create(hwmon_class, NULL, MKDEV(0,0), dev, HWMON_ID_FORMAT, id); if (IS_ERR(cdev)) { spin_lock(&idr_lock); idr_remove(&hwmon_idr, id); spin_unlock(&idr_lock); } return cdev; } /** * hwmon_device_unregister - removes the previously registered class device * * @cdev: the class device to destroy */ void hwmon_device_unregister(struct class_device *cdev) { int id; if (likely(sscanf(cdev->class_id, HWMON_ID_FORMAT, &id) == 1)) { class_device_unregister(cdev); spin_lock(&idr_lock); idr_remove(&hwmon_idr, id); spin_unlock(&idr_lock); } else dev_dbg(cdev->dev, "hwmon_device_unregister() failed: bad class ID!\n"); } static int __init hwmon_init(void) { hwmon_class = class_create(THIS_MODULE, "hwmon"); if (IS_ERR(hwmon_class)) { printk(KERN_ERR "hwmon.c: couldn't create sysfs class\n"); return PTR_ERR(hwmon_class); } return 0; } static void __exit hwmon_exit(void) { class_destroy(hwmon_class); } module_init(hwmon_init); module_exit(hwmon_exit); EXPORT_SYMBOL_GPL(hwmon_device_register); EXPORT_SYMBOL_GPL(hwmon_device_unregister); MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); MODULE_DESCRIPTION("hardware monitoring sysfs/class support"); MODULE_LICENSE("GPL");


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